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Delta Air Lines Chief Executive Gerald Grinstein said a request by the government's pension agency for a judge to reject the company's agreement with its pilots is "without merit." The agreement is necessary for Delta to emerge from bankruptcy protection, Grinstein added.

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Software glitches are becoming a leading safety challenge in aviation. It is more difficult to fix problems with the latest generation of jetliners because they use more than 5 million lines of software code. Older planes use just 1 million lines.

Traffic at Washington's Dulles International Airport has declined since the January demise of Independence Air. Some travelers are now flying into other airports, including Reagan National Airport, where traffic climbed 6.1% in the first quarter.

The Joint Strike Fighter's primary engine is running 190 degrees above the desired temperature, according to Pratt & Whitney engineers. The company this summer hopes to cut the amount of extra heat in half by adjusting the engine's bypass ratio, making air flow through the engine more efficient.

BAE Systems thinks the Eurofighter consortium could also develop an unmanned air vehicle program. BAE executives said their is potential for common UAV programs among European nations if they coordinate their requirements.